Nokea
The most common buffer system in the body is the:
- A. Plasma protein buffer system
- B. Phosphate buffer system
- C. Hemoglobin buffer system
- D. Bicarbonate-carbonic system
Correct Answer: D
Rationale: The correct answer is D, the bicarbonate-carbonic system. This buffer system is crucial in maintaining the body's pH balance. When CO2 combines with water in the blood, it forms carbonic acid, which dissociates into bicarbonate ions and hydrogen ions. Bicarbonate acts as a base, accepting excess hydrogen ions to prevent a decrease in pH. Hemoglobin and plasma proteins primarily function as transport molecules, not as buffer systems. Phosphate buffer system is present in intracellular fluids, not as commonly in the body. The bicarbonate-carbonic system is the most prevalent buffer system in the blood and plays a vital role in regulating blood pH.
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For a client with low blood volume, what are the implications of decreasing blood pressure and a rapid heart rate?
- A. Compression of blood vessels due to blood loss
- B. Increase in the circulating blood volume
- C. Inadequate renal perfusion
- D. Hypovolemia and shock
Correct Answer: D
Rationale: The correct answer is D: Hypovolemia and shock.
Rationale:
1. Low blood volume leads to decreased blood pressure and rapid heart rate as compensatory mechanisms.
2. These signs indicate inadequate perfusion due to reduced blood volume.
3. Hypovolemia can progress to shock if not addressed promptly.
Summary:
A: Compression of blood vessels is not directly related to low blood volume.
B: Increasing circulating blood volume would not occur in a client with low blood volume.
C: Inadequate renal perfusion is a consequence of hypovolemia, not an implication of decreasing blood pressure and rapid heart rate.
The nurse has entered a client’s room to find the client diaphoretic (sweat-covered) and shivering, inferring that the client has a fever. How should the nurse best follow up this cue and inference?
- A. Measure the client’s oral temperature.
- B. Ask a colleague for assistance.
- C. Give the client a clean gown and warm blankets.
- D. Obtain an order for blood cultures.
Correct Answer: A
Rationale: Step 1: Assess the client's vital signs to confirm presence of fever.
Step 2: Measure client's oral temperature to obtain accurate reading.
Step 3: Document temperature and report findings to healthcare provider.
Step 4: Initiate appropriate interventions based on temperature reading.
Step 5: Reassess client's condition to evaluate effectiveness of interventions.
Summary: Option A is correct as it directly addresses the cue of fever by confirming the temperature. Options B, C, and D are incorrect as they do not directly address the need to assess the client's temperature for accurate evaluation and intervention.
The nurse needs to administer an IM injection of 2.4 million units of penicillin G. it is supplied in a vial of 5,000,000 units of powder for injection. Instructions state to dilute with 8 mL of sterile water. How manu mL should the nurse draw up?
- A. 2.6 mL
- B. 4.1 mL
- C. 3.8 mL
- D. 4.4 mL
Correct Answer: C
Rationale: The correct answer is C: 3.8 mL. To calculate the volume needed, first determine the concentration of the solution after reconstitution: 2.4 million units / 5,000,000 units = 0.48. Next, divide the desired dose by the concentration: 2.4 million units / 0.48 = 5 mL. Since the instructions state to dilute with 8 mL of sterile water, the total volume will be 13 mL. To find the volume of the powder to draw up, subtract the water volume from the total volume: 13 mL - 8 mL = 5 mL. Therefore, the nurse should draw up 5 mL of the reconstituted solution, which is equivalent to 3.8 mL of powder for injection.
Incorrect choices: A, B, and D are incorrect because they do not consider the dilution factor of adding sterile water to the powder for injection. Option A is less than the
For the first 72 hours thyroidectomy surgery, the nurse would assess the client for Chvostek’s sign and Trousseau’s sign because they indicate which of the following?
- A. Hypocalcamia
- B. hypokalemia
- C. Hypercalcemia
- D. Hyperkalemia
Correct Answer: A
Rationale: The correct answer is A: Hypocalcemia. Chvostek's sign and Trousseau's sign are both indicators of hypocalcemia, which is a common complication following thyroidectomy surgery due to potential damage to the parathyroid glands. Chvostek's sign is elicited by tapping the facial nerve and observing facial muscle twitching, while Trousseau's sign involves carpal spasm induced by inflating a blood pressure cuff above systolic pressure. Both signs are sensitive indicators of hypocalcemia due to their association with neuromuscular irritability. Hypercalcemia (option C) and hyperkalemia (option D) are not typically associated with thyroidectomy surgery and would not present with these specific signs. Hypokalemia (option B) is not related to Chvostek's sign and Trousseau's sign.
The cause of death of most AIDS patients who develop multiple opportunistic infections is/are the following: a.Weakened immune system impairs response to therapy
- A. AH of these (a, b, c)
- B. Weakened immune system impairs resistance to infection
- C. Infection cannot be treated effectively
Correct Answer: A
Rationale: Rationale for Correct Answer (A): Most AIDS patients with multiple opportunistic infections die due to a weakened immune system impairing response to therapy. When the immune system is compromised, the body struggles to fight off infections effectively, even with treatment. This results in the infections becoming more severe and ultimately leading to death.
Summary of Other Choices:
B: Weakened immune system impairs resistance to infection - While this is true, it doesn’t directly address the cause of death in AIDS patients with multiple infections.
C: Infection cannot be treated effectively - This is not entirely accurate as infections can be treated, but the weakened immune system hinders the response to treatment.
Overall, Choice A is the most accurate as it directly links the weakened immune system to the inability to respond effectively to therapy, leading to fatal outcomes.